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36 #include "../../include/linux/libcfs/libcfs.h"
38 unsigned long cfs_fail_loc = 0;
39 EXPORT_SYMBOL(cfs_fail_loc);
41 unsigned int cfs_fail_val = 0;
42 EXPORT_SYMBOL(cfs_fail_val);
44 wait_queue_head_t cfs_race_waitq;
45 EXPORT_SYMBOL(cfs_race_waitq);
48 EXPORT_SYMBOL(cfs_race_state);
50 int __cfs_fail_check_set(__u32 id, __u32 value, int set)
52 static atomic_t cfs_fail_count = ATOMIC_INIT(0);
54 LASSERT(!(id & CFS_FAIL_ONCE));
56 if ((cfs_fail_loc & (CFS_FAILED | CFS_FAIL_ONCE)) ==
57 (CFS_FAILED | CFS_FAIL_ONCE)) {
58 atomic_set(&cfs_fail_count, 0); /* paranoia */
62 /* Fail 1/cfs_fail_val times */
63 if (cfs_fail_loc & CFS_FAIL_RAND) {
64 if (cfs_fail_val < 2 || cfs_rand() % cfs_fail_val > 0)
68 /* Skip the first cfs_fail_val, then fail */
69 if (cfs_fail_loc & CFS_FAIL_SKIP) {
70 if (atomic_inc_return(&cfs_fail_count) <= cfs_fail_val)
74 /* check cfs_fail_val... */
75 if (set == CFS_FAIL_LOC_VALUE) {
76 if (cfs_fail_val != -1 && cfs_fail_val != value)
80 /* Fail cfs_fail_val times, overridden by FAIL_ONCE */
81 if (cfs_fail_loc & CFS_FAIL_SOME &&
82 (!(cfs_fail_loc & CFS_FAIL_ONCE) || cfs_fail_val <= 1)) {
83 int count = atomic_inc_return(&cfs_fail_count);
85 if (count >= cfs_fail_val) {
86 set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc);
87 atomic_set(&cfs_fail_count, 0);
88 /* we are lost race to increase */
89 if (count > cfs_fail_val)
94 if ((set == CFS_FAIL_LOC_ORSET || set == CFS_FAIL_LOC_RESET) &&
95 (value & CFS_FAIL_ONCE))
96 set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc);
97 /* Lost race to set CFS_FAILED_BIT. */
98 if (test_and_set_bit(CFS_FAILED_BIT, &cfs_fail_loc)) {
99 /* If CFS_FAIL_ONCE is valid, only one process can fail,
100 * otherwise multi-process can fail at the same time. */
101 if (cfs_fail_loc & CFS_FAIL_ONCE)
106 case CFS_FAIL_LOC_NOSET:
107 case CFS_FAIL_LOC_VALUE:
109 case CFS_FAIL_LOC_ORSET:
110 cfs_fail_loc |= value & ~(CFS_FAILED | CFS_FAIL_ONCE);
112 case CFS_FAIL_LOC_RESET:
113 cfs_fail_loc = value;
116 LASSERTF(0, "called with bad set %u\n", set);
122 EXPORT_SYMBOL(__cfs_fail_check_set);
124 int __cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
128 ret = __cfs_fail_check_set(id, value, set);
130 CERROR("cfs_fail_timeout id %x sleeping for %dms\n",
132 set_current_state(TASK_UNINTERRUPTIBLE);
133 schedule_timeout(cfs_time_seconds(ms) / 1000);
134 CERROR("cfs_fail_timeout id %x awake\n", id);
138 EXPORT_SYMBOL(__cfs_fail_timeout_set);